US3466221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expanded silicate insulation
Assignee: PQ Corp
•
Filing: 1966-04-05
•
Granted: 1969-09-09
•
Expires: 1986-04-05
Abstract
No abstract record available.
Inventors
- 👤 Robert H Sams
- 👤 Newton W Mccready
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249969
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3136645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-08 | 1973-03-10 | 1973-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-08 | 1977-03-10 | 1977-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-08 | 1981-03-10 | 1981-09-09 | $7700.00 | Window Closed / Lapsed |